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<p>[QUOTE=&quot;desertgem, post: 1603780, member: 15199&quot;]Well before you do, look very very carefully with a strong light and magnifier on the high areas and rims of both sides. If it was generated by chemical means, you might find small area that might show a copperish color, as the chemicals might not have reacted with areas that contacted or came very close to the inner part of the beaker.[/QUOTE]</p><p><br /></p>

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